So everyone's trapped (4)

I believe the answer is:

very

'so' is the definition.
(I've seen this before)

'everyone's trapped' is the wordplay.
'trapped' indicates the answer is hidden within the clue.
'VERY' can be found hidden inside 'everyones'.

(Other definitions for very that I've seen before include "- light is a flare" , "Extremely - light" , "Frightfully" , "Ever so" , "Exactly, really" .)

I've seen this clue in The Guardian.

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